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$\"\"$

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$\"\"$ \ \

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$\"\"$ (Add 3x to each side)

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$\"\"$ (Using commutative property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Subtract: 12 – 27 = –15)

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$\"\"$

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The value of y = $\"\"$

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